prominent. much more so than we originally thought. >> the fbi says that the gangs are targeting vulnerable young girls in public and on social media sites. they sent 1000 messages from a bogus facebook account trying to lure girls in. >> they come in through the wire and they can visit you come up on seen by us. >> we spoke by phone from federal prison to one of the accomplices. they told us that they try to build trust with new victims. >> >> it even happens in schools. in these court documents, one victim said another girl in school recruited her, telling her she was a confident, pretty woman who could make lots of money. >> is a parent's worst nightmare. >> for these traffickers, it is a low-cost high profit enterprise. >> gang members literally taking girls as young as 12, 14, going to construction sites, places where they believe there is a paying customer base. >> these convicted ms-13 members were found guilty of trafficking near a church. >> we do not have any control over who is in the room and what they are doing. >> the victims can be tough to spot. >> they look just